3.08 Gear

shts_weak

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i currently have 3.55s and im debating if i should go with a 3.08? my car is a DD and it has 620rwhp..what are your thoughts/opinions?
 

keith89

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i currently have 3.55s and im debating if i should go with a 3.08? my car is a DD and it has 620rwhp..what are your thoughts/opinions?

I have 3.73's and wish I stuck with 3.55's or went with 3.27's with 550rwhp. I don't know of anyone who has gone to 3.08's. Might be a bit extreme.
 

mach1033

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I'm going 327's come summer. 308's and you will have a nice top end charge. I'm willing to bet that you would be the first to go to a 308.
 

HURTNEM

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I believe C6Zs come with 3.27s and Vipers come with 3.08s. I don't know of anyone with a Cobra that has tried 3.08s, but I'd imagine with your HP level it shouldn't bog off the line. You will definitely get much better traction and have longer gears which is great for the street. 0-60 in 1st gear will be a good time I'm sure!
 

keith89

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I believe C6Zs come with 3.27s and Vipers come with 3.08s. I don't know of anyone with a Cobra that has tried 3.08s, but I'd imagine with your HP level it shouldn't bog off the line. You will definitely get much better traction and have longer gears which is great for the street. 0-60 in 1st gear will be a good time I'm sure!

hmm interesting. something consider. I know i'm going from my 3.73's to at least 3.27's I'd like to know how 3.08's would be.
 

Sagittaria

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Someone needs to compute the speeds. When power goes up even only to 500 1st gear is WAY to short and 5/6th gear... well they aren't really that much of an over drive to start with. I absolutely hate the ratios the 03 cobras came with.
 

keith89

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Someone needs to compute the speeds. When power goes up even only to 500 1st gear is WAY to short and 5/6th gear... well they aren't really that much of an over drive to start with. I absolutely hate the ratios the 03 cobras came with.

Agreed 1st gear is too short. I have a spreadsheet at home that calculates speeds in each gear. I'll have to remember to dig it up.
 

shts_weak

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Gear MPH
1st 61.7
2nd 92.1
3rd 126.2
4th 164.0
5th 205.0
6th 260.4

Axle ratio 3.08 and RPM@6500

Tire size was 295/35/18
 
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Sagittaria

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Gear MPH
1st 61.7
2nd 92.1
3rd 126.2
4th 164.0
5th 205.0
6th 260.4

Axle ratio 3.08 and RPM@6500

Tire size was 295/35/18

That looks nice actually :rockon: I'm a big fan of the Corvette Z06 ratios... which it looks like almost (except they have actual overdrives :bash: ) Probably not the best for the strip w/ slicks but it'll get rid of the butt load of power coming way too soon everywhere else. Think they wanted the Terminators to be burnout machines only looking at the stock ratios/speeds :D

C6Z06
1st. 2.66 = 61 mph
2nd. 1.78 = 91 mph
3rd. 1.30 = 125 mph
4th. 1.00 = 162 mph
5th. 0.74 = 220 mph
6th. 0.50 = 325 mph

Us w/ 3.08s
1st. 2.66 = 61 mph
2nd. 1.78 = 92 mph
3rd. 1.30 = 126 mph
4th. 1.00 = 164 mph
5th. 0.80 = 205 mph
6th. 0.63 = 260 mph

A 3.08 might be in order I think :rockon:
 
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Blueline

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One thought I had since these "higher rear gear" threads have come up. Our cars are known to have a very tight piston to wall clearance, hence the no boosting in 5th and 6th gear. These gears really lug the motor and generate alot of heat because of it. Lowering to the 3.27 or 3.08 gears, wouldnt this cause the same now to happen in say 4th or 3rd if you dont pull 2nd all the way to the top? Maybe not so much 3rd, but def. 4th gear? I may be way off my rocker or nuts for thinking this but figured I would ask. Granted these would only be a concern with stock motors with stock pistons/wall etc with no mods. Any thoughts on this guys?
 

mach1033

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One thought I had since these "higher rear gear" threads have come up. Our cars are known to have a very tight piston to wall clearance, hence the no boosting in 5th and 6th gear. These gears really lug the motor and generate alot of heat because of it. Lowering to the 3.27 or 3.08 gears, wouldnt this cause the same now to happen in say 4th or 3rd if you dont pull 2nd all the way to the top? Maybe not so much 3rd, but def. 4th gear? I may be way off my rocker or nuts for thinking this but figured I would ask. Granted these would only be a concern with stock motors with stock pistons/wall etc with no mods. Any thoughts on this guys?

It would be more stressful than a stock geared 4th gear pull but not as bad as 5th/6th. Those overdrive gears do not stress the engine because of the additional time in the gear but rather because of the additional stress it causes to "chug" on the engine from overdriving it (each rev not creating 1 rev at the tailshaft of the trans. This stress finds the weak point in the engine. I.e. Piston to wall clearance. I quoted this from a tuner hope this helps.
 
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Blueline

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It would be more stressful than a stock geared 4th gear pull but not as bad as 5th/6th. Those overdrive gears do not stress the engine because of the additional time in the gear but rather because of the additional stress it causes to "chug" on the engine from overdriving it (each rev not creating 1 rev at the tailshaft of the trans. This stress finds the weak point in the engine. I.e. Piston to wall clearance. I quoted this from a tuner hope this helps.

:rockon: Thanks Al!
 

earico

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It would be more stressful than a stock geared 4th gear pull but not as bad as 5th/6th. Those overdrive gears do not stress the engine because of the additional time in the gear but rather because of the additional stress it causes to "chug" on the engine from overdriving it (each rev not creating 1 rev at the tailshaft of the trans. This stress finds the weak point in the engine. I.e. Piston to wall clearance. I quoted this from a tuner hope this helps.

I agree. Don't forget about the increased wind resistance at those high speeds making the strain on the driveline even greater. It gets exponentially worse the faster you go.
 

mach1033

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My main reason for going to a 327 is traction. Plus I like the idea of keeping it in gear longer.
 

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